Yani is the more serious counterpart to Yooni. She is more cold, quiet, and reserved.

Yani was born from the moon, and her companion is a night owl, together they go on Nightwatch and watch for dangers that lurk in the dark. She never leaves a mission uncompleted, and she strives to be a high-ranking Moon Fighter. Her sister, Yooni can be a distraction, but Yani finds a way to prevail even through impossible odds.

If the two can work together, they can be an unstoppable force, but their two striking personalities do not clash well.